George w



(No Model.)

G. W. STEWART.

TRANSMITTER AND SOUNDER. 4

No. 350,644. Patented Oct. '12, 1886.

Qv-i imaooeo MM 5 W N PETERS. Phabljllwgn ber, Washingwn. D. C.

UNITED STATES PATENT Grrrcn.

GEORGE V. STEWART, OF NE\V YORK, N. Y., ASSIGNOR OF ONEHALF TO STEPTIELT J. COX, OF SAME PLACE.

TRANSMITTER AND SOUNDER.

.SPECIFICATION forming part of Letters Patent No. 350,644, dated October 12, 1886. Application filed February 8, 1886. Serial X0. 191,192. (No model.)

T aZZ whom it may concern:

Be itknown that LGEoRGn W. STEWART, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Transmitters and Sounders; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part; of this specification.

My invent-i011 relates to a combined transmitter and sounder for sending and receiving telegraphic messages; and it consists in a construction and combination of parts located within an electro-magnet and its casing that may be varied and adapted to serve at one time as a transmitter of a message and at another time as a receiver for a message, as will be hereinafter fully set forth.

Inthe annexed drawings, illustrating my invention, Figure 1 is a vertical section through the instrument as arranged to serve as a receiver or sounder, and shows a portion of the coil of an electro-magnet in cross-scction and a portion of the core in elevation. Fig. 2 is an end view of the instrument, with the switch arranged to properly direct the currentstor receiving messages. Fig. is a vertical section of the instrument when used as a transmitter. Fig. 4 is an end view of the same, with the switch properly placed. Fig. 5 is a perspective view of the button, spindle, and armature; and Fig. 6 is a perspective of the elcctro-magnet.

Like letters of reference designate like parts in the several views.

A represents the cylindrical magnet-casing, made of rubber or other suitable material. \Vithin this, at one end, is situated an electromagnet,composed ofgutta-percha ends, asoftiron core, 0, and a proper]yinsnlated wire coil surrounding the core. A diaphragm, D, is adjustably secured within the other end of the casing, so that it may be moved toward or away from the electroanagnct. In the drawings the adjustability of the diaphragm is offected by screw-threading the cylindrical portion thereof to engage the screw-threaded i n terior of the casing; but it is obvious that various other means for adjusting the diaphragm may be employed. A touch-button, E, is fixed upon the end of a spindle, b, which passes through a central perforation in the diaphragm D, the lower end entering a recess or slot in the core of the magnet. The spindle b is also provided with a soft-iron plate, F, and with collars c 0, located one on each side of the diaphragm. The lower end of the spindleis made of brass,or other material which will not conduct the magnetic current, and the upper end is preferably screw-threaded, (see Fig. 1,) so that button E and upper collar. 0, may be adjustable thereupon. This enables the oper ator to vary the distance between the collars c c, in order to increase or diminish the click of the sounder, which takes place when said col- 7o lars strike the diaphragm. \Vithin the recessed core is a spring,which bears against the bottom of the rcccss,and also against the plate F, and serves to return the spindle upward into position after it has been depressed by the finger in transmitting a message,or by the current in receiving one. The upper end of the spool of the magnet is provided with a screw or pin, (2, with which the armatureplate F(the instrument being used as a transn'iitter) may be 8c permitted to come into contact when the spindle dewends through pressure upon the button. The top of the screw is slightly above the top of the core 0, so that the armature can at no time touch the core, although whenever a magnetic current is induced in the core the armature will be drawn toward it. The lower end of the spool is provided with a post, G, a post, H, a screw, 9, and a switch, I, pivoted by means of a screw in the lower end of the core 0. The post G connects with one end of the coil B; the screwy connects with the other end. 'The post H does not connect directly with. the coil, but is kept constantly connected with the screw or pin (2 by means of a short 5 wire, a, passing between the coil and the casing. These constant connections are, however, varied and supplemented by means of the switch I, preferably having a lug, c, for its easy manipulation, said switch serving to connect either post with the end of core, also to connect post H with screw The instrument thus constructed is adapted to be operated as a transmitter, or as a sounder y or receiver. When it is used as a sounder, the

parts will be arranged as shown in Figs. 1 and 2. The diaphragm D will be adjusted to a position sufficiently far from the magnet so that the armature F will never during its vibrations touch the screw d, for should the armature touch the screw the resonance of the sounding-diaphragm would be deadencd, so that the click would be rendered-indistinct or double. The collars c c, as above stated, can be adjusted to afford more or less resonance of the diaphragm, so that, if desired, a very weak sound may be obtained, which will be indistinguishable by persons at a distance from the instrument. Further, the switch I in the present case is so placed that the post H, the soft-iron core, and the screw 9 are connected. Suppose, now, an electric current to reach the instrument at the post H, through the wire fastened thereto. It will pass through post H,

into and through the switch 1, into the screw g, and thus into the coil. After completing the circuit of the coil it will enter the post G and pass away from the instrument by the wire connecting with said post. The passage of the current through the coil about the core will temporarily magnetize the same, which will act to draw the armature F toward it, and producea click at the diaphragm. \Vhcn the current has passed, the spring will replace the armature. The lower end of the spindle being of brass it is unaffected by the magnetic influence.

Suppose, 110w, we desire to use the instrument as a transmitter, Figs. 3 and 4 show the rela' tive arrangement of the parts. The diaphragm is so placed with respect to the magnet that the armature F may be depressed to touch the screw (1, and the switch I connects the post G and the magnet-core. When the button E is depressed, the armature will touch the screw and the circuit be made complete. Then the current, supposing it to enter through the post H, as shown by the arrows, (it may conceivably come in either direction, according to the location of the battery,) entering post H, will pass through the short wire a to the screw (1, thence into the armature F, down the spindle, into and through the core, and then through the switch to post G and to line-wire. The removal of the finger from the button allows the spring to replace it in proper position for the next depression. In this case it will be noticed that the current does not pass through the coil, but'through the accessory wire a.

. Having thus described my invention,what I claim as new, and desire to secure by Letters Patent, is- A 1. Thecombination of a magnet-casing, an electro-magnet situated within the same near one end, a sounding-diaphragm adjustably secured within the opposite end, and a spin dle carrying collars and an armature, and extending from the diaphragm to the core of the electro-magnet, substantially in the manner and for the purposes herein specified.

2. Atransmitter and receiver for telegraphic messages, consisting of a sounding-diaphragm, a spindle depressed by the finger in sending, or by the attraction of the magnetic current in receiving, and automatically retracted, and an electro-magnet provided with a supplemental wire, and with posts, screws, and a switch, as described, for directing the current through the supplemental wire and the core in sending, and through the coil in receiving, substantially as shown and described.

3. The combination, with an electro magnet and its casing, of an adjustable diaphragm and a spindle provided with touch-button, armature, and collars, one-end of said spindle passing through the diaphragm, while the other'end enters the recessed core'of the ele'c tromagnet, and said collars being situated on opposite sides of the diaphragm with the distance between them variable to regulate the loudness-of the click, substantially as shown and described.

4. The combination of the casing A, adjustable diaphragm D, the spindle I), provided with button E, armature F, collars e c, antLa spring for returning the spindle to its normal condition when depressed, the eleetro-magnet spool having core 0, and .wire coil B, the upper end of said spool having a screw, cl, and the lower end being furnished with a post, G, connecting with one end of the coil, a screw, 9, connecting with the other end of the coil, and the post H, connecting with screw (1 by a wire, a, and the switch I, substantially as represented and set forth.

5. A telegraphic instrument arranged to serve as a sounder and as a transmitter, and consisting of the following essential elements: an adjustable sounding-diaphragm, a spindle having a button adj ustabl y secured to the upper end, adjustable collars for striking the diaphragm, and an armature, an elect-ro-magnet provided with a core in contact with the spindle, a screw, d, which the armature intermittently touches, the post G, post H, and screw 9, and wire a, with connections as described, and the switch I, adapted to connect post G and the magnet-core for directing the current in sending the message, and adapted to connect post H and screw 9 in receiving IGL a message, substantially as shown and described.

6. The combination of the casing A, adjustable diaphragm D, spindle I), having button E, collars c e, armature F, and"retractingspring, and an electro-magnet having a reccssed core which contains the lower end of the spindle and its retracting-spring, having also a screw, (7, on the upper end, a post, G, post H, screw and switch I on the lower end, and a connecting-wire, (1, arranged and operating as shown and set forth.

' In testimony whereof I affix my signature in presence of two witnesses.

4 GEORGE XV. STEWART. Wi tn esses: JOHN C. CENTER, M. L. BAUM.

A Mam -t- 

